[c-nsp] buffer leak in 12.4(19)?

[Adam Greene]

Hi,

I have a 2811 router running Advanced IP Services 12.4(19) which has been 
acting funny.

First issue I had was after inserting (2) WIC-1ADSL cards the processor 
jumped to 99%. After shutting down the interfaces and rebooting, the router 
went back to normal.

Now the router is becoming intermittently inaccessible via telnet, while 
still passing traffic through its interfaces.

Total interfaces on unit:
(2) WIC-1DSU-T1-V2
(2) WIC-1ADSL
(1) NM-HDV2-1T1/E1 w/ (2) PVDM2-32 daughter cards

The other thing we did recently is add the NM-HDV2-1T1/E1. Before adding 
these cards, we never had an issue.

Running a "show controller serial x/x/x" and a "show buffer" through the 
Output Interpreter, I am told:

"WARNING: The interface Serial0/0/0 has reported 449 'overruns'. This is 
because, the input rate exceeds the ability of the receiver to handle data 
.... Paste the output of the show buffer command output into the Output 
Interpreter to check whether the buffers can be tuned. "

"ERROR: Since its last reload, this router has created or maintained a 
relatively large number of 'h2p1 buffers' yet still has very few free 
buffers. The above symptoms suggest that a buffer leak has occurred."

I'm wondering if a buffer leak could be the source of the issue. Maybe this 
wasn't a problem before the router had the new DSL cards and T1 network 
module, but now the new cards are claiming too much memory and the buffer 
leak is causing issues.

We could try down or upgrading the IOS ....

Thanks for advice,
Adam